Need help to chose - Kata, Akali or Kenen (i play Talon)

Hi All, I just need someone similar, but different to what I play - Talon {{champion:91}} And assassins in general, since love that play stile and being unpredictable, while being able to take down champions quick and disappear :) So? Need help to chose - Kata {{champion:55}} , Akali {{champion:84}} or Kenen {{champion:85}} (i play Talon) Are they viable just mid, or can be Top, as well (since I do play top with Talon {{champion:91}} and to be honest is pretty sick)
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